Machu Picchu with the Huayna peak: The ruined city was built by the Incas in the 15th century at an altitude of 2,430 meters in the Andes (Peru).
The citadel with Huayna Picchu rising behind it, built by the Incas in the 15th century at an altitude of 2,430 metres. © W. Bulach, CC BY-SA 4.0, via Wikimedia Commons

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